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Published in: Journal of Material Cycles and Waste Management 2/2024

31-10-2023 | SPECIAL FEATURE: ORIGINAL ARTICLE

Enhanced recovery of gold from aqua regia leachate of electronic waste using dithiocarbamate-modified cellulose

Authors: M. Mehedi Hasan Rocky, Ismail M. M. Rahman, Yuto Sakai, Foni B. Biswas, Shafiqur Rahman, Masaru Endo, Kuo H. Wong, Asami S. Mashio, Hiroshi Hasegawa

Published in: Journal of Material Cycles and Waste Management | Issue 2/2024

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Abstract

Electronic waste (e-waste) has emerged as a valuable secondary source of metals, including precious metals (PMs), surpassing those found in natural ores. The objective of this study is to explore the use of cellulose-based adsorbents, specifically dithiocarbamate-modified cellulose (DMC) and proline-incorporated DMC with epoxy-cross-linkage (DMC-Pro-Epo6), in the recovery of Au from e-waste, particularly under harsh aqua regia (AR) conditions. DMC adsorption behavior in AR is influenced by several factors, such as AR dilution, pre-adsorption phenomena, contact time, and AuIII concentration. DMCs displayed competitive adsorption across varied AR dilutions, benefiting from diluted AR due to hindered adsorption in undiluted AR. Contact time analysis demonstrated rapid AuIII adsorption, with equilibrium achieved in approximately 30 min. Four anion exchange-type commercial resins (Lewatit MonoPlus TP 214, Diaion WA30, Dowex 1X8, and AmberChrom 1X8) and one chelating CR (Q-10R) were tested for comparison, and their adsorption capacities were evaluated. Both the DMC and DMC-Pro-Epo6 have higher adsorption capacities for AuIII than commercial resins, which can be attributed to their sorption-active dithiocarbamate functional groups. The study also outlined a step-by-step Au extraction from printed circuit boards (PCBs), and the effective recovery of metallic Au from PCBs using DMCs was demonstrated.

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Appendix
Available only for authorised users
Literature
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Metadata
Title
Enhanced recovery of gold from aqua regia leachate of electronic waste using dithiocarbamate-modified cellulose
Authors
M. Mehedi Hasan Rocky
Ismail M. M. Rahman
Yuto Sakai
Foni B. Biswas
Shafiqur Rahman
Masaru Endo
Kuo H. Wong
Asami S. Mashio
Hiroshi Hasegawa
Publication date
31-10-2023
Publisher
Springer Japan
Published in
Journal of Material Cycles and Waste Management / Issue 2/2024
Print ISSN: 1438-4957
Electronic ISSN: 1611-8227
DOI
https://doi.org/10.1007/s10163-023-01824-3

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